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authorAndy Henroid <andrew.d.henroid@intel.com>2008-10-09 11:45:22 -0700
committerLen Brown <len.brown@intel.com>2008-10-21 23:58:41 -0400
commit27471fdb32e77ecb92f09d4ac5757785b4dc33bc (patch)
tree2895d9918c019f48db32d479a2fc9f8725a3ed6e /drivers/dma
parentc7d87d79d14cecab7a34dedf1b133377cf5a0203 (diff)
downloadlinux-27471fdb32e77ecb92f09d4ac5757785b4dc33bc.tar.bz2
i7300_idle driver v1.55
The Intel 7300 Memory Controller supports dynamic throttling of memory which can be used to save power when system is idle. This driver does the memory throttling when all CPUs are idle on such a system. Refer to "Intel 7300 Memory Controller Hub (MCH)" datasheet for the config space description. Signed-off-by: Andy Henroid <andrew.d.henroid@intel.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/ioat_dma.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index bc8c6e3470ca..f8396cafa05f 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -171,6 +171,9 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET);
xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale));
+#if CONFIG_I7300_IDLE_IOAT_CHANNEL
+ device->common.chancnt--;
+#endif
for (i = 0; i < device->common.chancnt; i++) {
ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
if (!ioat_chan) {